In the paper results of a research of electrophysical properties of 3D-printed composites based on polyethylene glycol terephthalate and barium ferrite at the of extremely high frequency region (34-258 GHz) are presented. Frequency dependences of composites for a ferrite concentration of 40, 50 and 60 wt .% are given. At a frequency ~ 48 GHz, the region of selective absorption due to ferromagnetic resonance has been experimentally determined. The possibility of using PETG/BaFe12O19 composites in the additive technology are assessed.
In this paper, the results of the research of electromagnetic characteristics of composite materials based on polyethylene terephthalate glycol and black carbon at the Sub-THz frequency range are presented. The samples of composite materials obtained by the additive technology have been made. The frequency dependencies of complex permittivity at the frequency range from 115 GHz to 258 GHz have been measured. The calculated frequency dependences of the absorption coefficient for composites based on Polyethylene terephthalate glycol and black carbon at concentrations of 10, 15, 20 and 25 wt.% are given. The efficiency of absorption of electromagnetic radiation of 3D-printing black carbon contains materials at sub-THz range is shown.
In recent years, there has been a trend in expanding additive technology, in particular in the production engineering of elements millimeter and submillimeter range. The results of research of the dielectric properties of composite materials based on acrylonitrile styrene acrylate matrix and inclusions of multi-walled carbon nanotubes at the frequency range 115-258 GHz are presented. A technique for producing a composite filament for 3D-printers based on the fused deposition method is described. The electromagnetic response and the calculation of the complex permittivity of 3Dprinted samples of composites are given. The applicability of these composites in absorbers of Sub-THz radiation is assessed.
Quite extensive test sites are needed to provide remote sensing methods of the Earth with reliable information on the electrical characteristics of the surface layer and on their daily-seasonal changes. Observation is constantly made on them for the main indicators that determine the results of sensing. The paper discusses a set of tools using radiophysical and optical methods for long-term studies of the properties of the environment at the test station "Kaybasovo".
The possibility of monitoring of thermokarst lake water volume of arctic and subarctic regions by remote sensing radiophysical methods is considered. The purpose of monitoring is to control global changes in the Earth's climate. Samples of natural water from water sources of the Tomsk region and the Yamalo-Nenets autonomous region (test site is the village of Khanomyi) are studied. The measurements were carried out by a microwave instrument based on an irregular microstrip resonator and by a conductometer made according to the original scheme.
The large Halo orbit in L2 of the ATHENA mission will expose the spacecraft (SC) to a significant flux of charged particles which is expected to overlap with the energy range of the instruments. This is a source of measurement background that needs to be minimized as much as possible to achieve the strict requirements of the mission. The need to know and mitigate this type of background has been identified as critical, and has led to a number of technology development activities which are progressing in parallel to the Phase A activities. Particularly, this paper details the status of the on-going activities to develop a set of charged particle diverters whose goal is to reduce the background generated by soft-protons which are focused by the Silicon Pore Optics (SPO) mirror modules towards the instrument detectors. This paper explains the considerations leading to an accommodation of the charged particle diverters close to the instruments in the Science Instrument Module (SIM), and details the analytical approach followed to choose the massoptimal location for the case of a uniform magnetic field Halbach design. The case of graded (non-uniform) magnetic fields is also explained in an effort to further decrease the mass. Preliminary magnetic field maps are presented as a proxy to compare the mass from different options. Finally, the first engineering models, manufacturing and test plans are presented which are the focus of a technology development activity aiming at the validation of the technologies involved up to TRL5.
The results of development the automated system of two-dimensional diagnostics of defects of crystalline materials are presented. Used technology imaging. The structural scheme of the system is given, its main blocks are indicated, the approbation process is described, the software of the system is described.
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